These guys live closer to the center of Neptune, in the largely ammonia sea. They tend to stay kind of far away from the Chiru, and vice versa, but they DO mint the currency, because it's made from the shells of the dirk, a mollusc that lives only in ammonia. This keeps the balance of power fairly even despite the Chiru having exclusive access to the atmosphere.
If they leave the planet, they don't do very well on land, only able to scuttle and crawl.

Their economy is bustling! They have some machines.. and farm animals and plants on the rocky part of the inner planet for food.

Interesting biological structure: the head and torso have internal bones, while the limbs have an exoskeleton. The tentacles have ring-shaped bones, spaced apart, allowing them to stretch a lot.

they're about 7 feet tall, the royalty are the tallest.

males, as you can see, have horns and thicker brows.

lifespan of 150 Terran years... which is less than one Neptune year.. but down in the deep sea they can't see any celestial bodies anyway.

btw, the tongue is anchored to the top of the mouth, not the bottom.

they're wholly without magic, but with a lot of training, some can produce electricity through the horns and tentacles. also they can squirt ink out their mouths, though not a whole ton of it.